Automatic experiment and analysis device for measuring air relative pressure coefficient

Abstract

The invention provides an automatic experiment and analysis device for measuring an air relative pressure coefficient. The automatic experiment and analysis device comprises a beaker, a motor, a stirring blade, a bubble, a heating bar component, a temperature measuring module, a magnetic exchange valve, a pressure detection device, a pressure detection module, a magnet driving unit, a mechanical pump driving unit, a mechanical pump, a PWM control unit, a stirring motor driving unit and an MCU unit. The device can automatically implement gas path switching, temperature measuring and control, experimental state judging as well as temperature and pressure data acquisition and analysis; and the device can greatly improve automation degree and experimental data accuracy of an experimental process, simplify operations, conduct intuitive display and improve an experimental effect.

Description

technical field [0001] The invention relates to a measurement technology, in particular to an automatic experiment and analysis device for measuring air relative pressure coefficient. Background technique [0002] Measuring the relative pressure coefficient of air with a sensor is a given experiment in the university physics syllabus, which involves a wide range of schools and majors. The existing experimental operation methods have been used for decades, and the experimental process is basically completed by manual operation, such as figure 1 shown. The experimental method is to complete the calibration of the pressure difference sensor first, and determine the output voltage Uo and the linear proportional coefficient Kp when the pressure difference of the diffused silicon piezoresistive sensor is zero. combine Figure 9 , Slowly turn the three-way piston, so that the C buckle of the differential pressure sensor communicates with the B tube and the A bubble is disconnect...

AI Technical Summary

Problems solved by technology

[0003] The above operations are basically completed by manual experimental operation and measurement. The problem is that repeated operations are inefficient and error-prone; the temperature is controlled by manually adjusting the constant current source to heat the copper wire. This temperature control method, due to the use of The control accuracy of the open-loop method is low, and the thermal balance of the temperature in the bubble cannot be guaranteed; when heating, a stirrer must be used to stir manually to control the thermal balance to ensure accurate readings. If the local temperature rises rapidly, it will cause Ut and Up to change continuously, which cannot be recorded data

Data collection and analysis are done manually, the operation cycle is long, the efficiency is low, problems need to be dealt with afterwards, the data in the experimental process cannot be collected, processed, analyzed and displayed in real time, and the whole experimental process is far behind the modern experimental methods and measurement technology

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